Make the function signature less prominent, add an early example to docs

Signed-off-by: Nick Cameron <nrc@ncameron.org>

docs/kcl-std/functions/std-sketch-startProfile.md

@@ -8,15 +8,17 @@ layout: manual
 Start a new profile at a given point.
 
 ```kcl
-startProfile(
-  @startProfileOn: Plane | Face,
-  at: Point2d,
-  tag?: TagDecl,
-): Sketch
+exampleSketch = startSketchOn(XZ)
+  |> startProfile(at = [0, 0])
+  |> line(end = [10, 0])
+  |> line(end = [0, 10])
+  |> line(end = [-10, 0])
+  |> close()
+
+example = extrude(exampleSketch, length = 5)
+
 ```
 
-
-
 ### Arguments
 
 | Name | Type | Description | Required |
@@ -30,6 +32,16 @@ startProfile(
 [`Sketch`](/docs/kcl-std/types/std-types-Sketch) - A sketch is a collection of paths.
 
 
+### Function signature
+
+```kcl
+startProfile(
+  @startProfileOn: Plane | Face,
+  at: Point2d,
+  tag?: TagDecl,
+): Sketch
+```
+
 ### Examples
 
 ```kcl